[FFmpeg-user] Best way to scale interlaced video
nickrobbins at yahoo.com
Tue Feb 25 23:35:40 CET 2014
> On Tuesday, February 25, 2014 3:11 PM, Andrey Aleksandrovich <andrey.aleksandrovich at googlemail.com> wrote:
> > On 2/25/14, Massimo Battistel <battistel at gmail.com> wrote:
>> I have to scale 16:9 interlaced 1080i video down to PAL 576i 4:3 with black
> Do you really need 4:3 aspect?
> If so, you can do something like that chain:
> 1920x1080 at 50i -> (lossless codec) 1920x540 at 50p -> (lossless codec)
> 720x576 at 50p -> 720x576 at 50i
I think this is actually a terrible idea. Rescaling the interlaced fields will introduce artifacts. I see that the scale filter has an "interlaced aware scaling" option that seems to be what he should use. With that in mind, I think his question of "how does interlaced aware scaling work" is the real questions.
> It is the best way to save time resolution (frame fields - fine motion
> scenes), while the static scenes will be little worse, cause of
> upscale fields from 540 to 576. However, you can to do not upscale and
> replace those 36 lines with black borders. Aspect ratio will be lost
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